dubdisciple
Keni
I guess you could try it... Individually convert each audio track to MIDI using Melodyne... You'll need the full version if you have polyphonic audio tracks (chords)...
Long job and will probably need a lot of editing along the way... ;-)
Keni
Maybe I misunderstood the OP, but it seemed like he wanted to take a single audio file like a fully mixed song and extract it to gm file.
<ouch>... My apology... I didn't catch that...
Ok... All I can think ther would be multiple passes attempting to isolate individual instruments with R-Mix... Then do as I previously mentioned...
That's really a tall order even for machine intelligence.... Yet...
But I see this has already been mentioned...
I agree that it's probably far easier to find and taylor an existing MIDI file than to attempt creating it from a single stereo file...
Keni